[sams99]

The terms do get a bit tricky, with forking servers like "unicorn" that do copy-on-write memory we also have the term PSS which is a far more accurate was to calculate memory impact for such servers.

The difference between the RAM your program uses to PSS to actual memory your process can reach vs the memory your program has allocated can all make your head spin. Agree it makes sense to add a section to illustrate this.